JP2003039082A - Fenton's reaction tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Fenton's reaction tank capable of reducing the inflow of SS to an ultraviolet irradiation treatment tank arranged to a rear stage. SOLUTION: A discharge flow channel 5 for discharging washing water and washing air flowing in from the region under an iron catalyst filled bed 27 is allowed to communicate with the Fenton's reaction tank at a position higher than the upper surface of the iron catalyst filled bed 27 filled with an iron catalyst and an outflow channel 47 of water to be treated flowing in from the region under the iron catalyst filled bed 27 is allowed to communicate at a position higher than the communication part 33 of the discharge flow channel 5. A filter member 31 is provided between the iron catalyst filled bed 27 and the communication part 33 of the outflow channel 5 of water to be treated. The filter member 37 is movable up and down corresponding to a water level between the iron catalyst filled bed 27 and the communication part 33 of the outflow channel 5 of water to be treated and an overflow weir 44 for determining the water level of washing water at the time of washing is formed to the communication part 33 of the outflow channel 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment Fenton reaction tank for oxidative decomposition of substances contained in water to be treated.

[0002]

2. Description of the Related Art As a method of oxidatively decomposing organic chlorine compounds such as tetrachloroethylene contained in water to be treated, biodegradable organic substances dioxin, PCB, etc., as disclosed in Japanese Patent Publication No. 6-83828, etc., A method is known in which hydrogen peroxide is added to water to be treated, and then the water to be treated is brought into contact with an iron catalyst to oxidize and decompose by the Fenton reaction.

[0003]

By the way, in the conventional Fenton reaction tank in which the water to be treated which has flowed into the iron catalyst packed bed filled with the iron catalyst is allowed to flow out of the tank, the suspension in the water to be treated is required. When the substance (hereinafter abbreviated as SS) is trapped in the iron catalyst packed bed, the contact area between the iron catalyst and the water to be treated, that is, the effective surface area of the iron catalyst decreases, and the reaction efficiency of the Fenton reaction decreases. I will end up. For this reason, the inventors of the present application are considering cleaning the iron catalyst packed bed periodically or according to the closed state of the iron catalyst packed bed to remove the SS trapped in the iron catalyst packed bed.

However, in the cleaning method used in a general filter tank in which the wash water flows into the outflow passage of the water to be treated at the time of washing, the iron catalyst packed bed is downstream of the flow of the water to be treated. On the side, that is, on the inner wall surface of the Fenton reaction tank on the secondary side or the outflow passage of the water to be treated, there is a possibility that SS that has flowed out from the iron catalyst packed layer due to cleaning may adhere. When SS is attached to the secondary inner wall surface of the Fenton reaction tank or the outflow passage of the water to be treated, the SS is entrained in the water to be treated, and the SS is carried out later than the Fenton reaction tank. Flow into the UV irradiation treatment tank disposed downstream of the Fenton reaction tank, and the treatment efficiency of the water to be treated due to UV irradiation is reduced.

In order to reduce the inflow of SS into the UV irradiation treatment tank, a cleaning process for removing SS adhering to the inner wall surface of the secondary side of the Fenton reaction tank or the outflow passage of the water to be treated is carried out, It is conceivable to perform a waste water process in which the treated water containing SS that flows out from the Fenton reaction tank is discharged and discarded before the UV irradiation treatment tank when the flow of the treated water to the Fenton reaction tank is started. . However, it is not preferable to perform such a washing process and a waste water process because the washing work and the water treatment work become complicated.

An object of the present invention is to reduce the inflow of SS into the ultraviolet irradiation treatment tank arranged in the subsequent stage of the Fenton reaction tank.

[0007]

The Fenton reaction tank of the present invention is provided with cleaning water and cleaning air flowing from below the iron catalyst packed bed at a position higher than the upper surface of the iron catalyst packed bed packed with iron catalyst. The above-mentioned problem is solved by providing a structure in which the discharge flow path for discharging is connected, and the discharge flow path of the water to be treated that has flowed in from below the iron catalyst packed bed is connected at a position higher than the communication part of this discharge flow path. To do.

With such a structure, the washing water entrained with air bubbles flowing from the lower side of the iron catalyst packed bed is used at predetermined intervals or when the filtration resistance of the iron catalyst packed bed exceeds a preset value. For example, by washing the iron catalyst-filled layer, SS trapped in the iron catalyst-filled layer can be discharged from the iron catalyst-filled layer. Further, the wash water accompanied with SS is discharged from the discharge flow path communicating with a position lower than the communication part of the outflow flow path of the water to be treated. Therefore, the place where SS is attached to the inner wall surface of the secondary side of the Fenton reaction tank is limited to the inner wall surface from the upper surface of the iron catalyst packed layer to the discharge passage of the wash water, and the outflow of the treated water No wash water flows in the flow path, and SS does not adhere to the outflow path of the water to be treated. As described above, since the SS adhered portion is in a limited range of the secondary side inner wall surface of the Fenton reaction tank, the S adhering to the secondary side inner wall surface of the Fenton reaction tank or the outflow passage of the water to be treated.
The SS adhering to the inner wall surface of the secondary side of the Fenton reaction tank can be removed by simply flowing an extra washing water after the SS of the iron catalyst packed layer is removed without performing a washing step for removing S or a waste water step. Can be removed. Therefore, it is possible to reduce the inflow of SS into the ultraviolet irradiation treatment tank arranged in the subsequent stage of the Fenton reaction tank.

Further, when a filter member is provided between the iron catalyst packed bed and the communicating portion of the outflow passage of the water to be treated, the iron catalyst packed bed and the Fenton reaction tank 2 can be disposed during the treatment of the water to be treated. The SS flowing out to the next side can be captured, and the SS can be prevented from flowing out of the Fenton reaction tank to the subsequent step. Therefore, the inflow of SS into the ultraviolet irradiation treatment tank arranged in the subsequent stage of the Fenton reaction tank can be further reduced, which is preferable.

Further, the filter member is vertically movable between the iron catalyst packed bed and the communicating position of the outflow passage of the water to be treated according to the water level, and the exhaust passage for discharging the washing water and the washing air. An overflow weir that determines the water level of the washing water at the time of washing is formed in the communication part of. With such a configuration, during the treatment of the water to be treated, the filter member can be raised to the vicinity of the communicating position of the outflow passage of the water to be treated to prevent SS from flowing into the outflow passage of the water to be treated. it can. In addition, at the time of cleaning, the water level of the wash water determined by the overflow weir is determined, so that the filtration member lowers until the upper surface of the filtration member comes close to the upper edge of the overflow weir, so bubbles are entrained. The entire filtering member can be washed with the washing water.

Further, cleaning air blowing means for blowing cleaning air is installed in the inlet chamber into which the water to be treated and the cleaning water flow, and an iron catalyst packed layer is provided on the inlet chamber. If it is configured to communicate with the inlet chamber through multiple strainers, the water to be treated can flow through the entire iron catalyst packed bed as uniformly as possible with multiple strainers, improving the reaction efficiency of the Fenton reaction. It is preferable because it is possible.

Further, the water treatment apparatus in which hydrogen peroxide-injected water to be treated is passed through a Fenton reaction tank equipped with an iron catalyst packed bed, and the water to be treated flowing out of the Fenton reaction tank is irradiated with ultraviolet rays. If the Fenton reaction tank is any one of the above Fenton reaction tanks, it is possible to reduce the inflow of SS into the ultraviolet irradiation treatment tank arranged in the subsequent stage of the Fenton reaction tank, so that the water treatment efficiency of the water treatment device is improved. Can be improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a Fenton reaction tank to which the present invention is applied and a water treatment apparatus including the Fenton reaction tank will be described below with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view showing a schematic configuration of a Fenton reaction tank to which the present invention is applied and an operation of a state body performing water treatment. FIG. 2 is a block diagram showing a schematic configuration of a water treatment apparatus including a Fenton reaction tank to which the present invention is applied, and flows of water to be treated, cleaning water, and cleaning air. FIG. 3 is a cross-sectional view showing a schematic configuration of a Fenton reaction tank to which the present invention is applied and an operation of a state body being cleaned.

The Fenton reaction tank 1 of this embodiment is shown in FIG.
As shown in FIG. 2, a treatment tank part 3 for performing the Fenton reaction treatment of the water to be treated 2 is provided in a side-by-side shape of a cylinder having both ends closed, and is discharged from the treatment tank part 3. It is formed by a cylindrical cleaning drainage tank portion 5 and the like, both ends of which serve as a discharge channel for cleaning water. An inlet chamber 7 into which the water to be treated and the cleaning water flow is formed at the bottom of the treatment tank 3. An inlet pipe 9 that communicates with the inlet chamber 7 for guiding the water to be treated into the inlet chamber 7 is connected to the side wall of the inlet chamber 7, that is, the side wall of the bottom of the treatment tank 3. A cleaning air conduit 11 through which cleaning air flows is inserted into the bottom surface of the inlet chamber 7, and an air diffuser 13 is provided at an end of the cleaning air conduit 11 located in the inlet chamber 7. Has been. Further, a drain pipe line 15 communicating with the inlet chamber 7 for discharging the water in the treatment tank portion 3 is connected to the bottom surface of the inlet chamber 7.

The inlet pipe 9 is provided with a treated water inlet valve 17 for controlling the flow of the treated water into the treatment tank section 3. A cleaning water conduit 19 for guiding the cleaning water into the inlet chamber 7 through the introduction conduit 9 is provided in a portion of the introduction conduit 9 between the treated water inlet valve 17 and the inlet chamber 7 of the treatment tank portion 3. Are connected. The wash water conduit 19 is provided with a wash water inlet valve 21 that controls the flow of wash water into the treatment tank 3. In addition, a cleaning air blowing valve 2 for controlling the blowing of the cleaning air into the processing tank portion is provided in the cleaning air pipeline 11.
3, the drain pipe 15 is provided with a drain valve 25 for controlling the discharge of water in the treatment tank unit 3.

The upper surface of the inlet chamber 7 that defines the inlet chamber 7 is a filter floor plate 29 that serves as the bottom surface of the iron catalyst packed bed 27 disposed on the inlet chamber 7. That is, the inlet chamber 7 and the iron catalyst packed bed 27 are partitioned by the filter floor plate 29. A plurality of strainers 31 are fixed to the filter floor plate 29 while being inserted into the filter floor plate 29. The iron catalyst packed layer 27 is
The filter floor plate 29 is used as the bottom surface, and the iron catalyst such as porous granular or cotton-like iron fibers is deposited and filled on the filter floor plate 29. The iron catalyst to be filled can be used in various shapes such as porous particles and cotton-like particles made of iron fibers, but when the concentration of suspended substances (hereinafter abbreviated as SS) in the water to be treated is relatively high. Since it is less likely to be clogged with SS, it is desirable to use a cotton-like material made of iron fiber. Further, an iron catalyst replenishing port 32 for replenishing the iron catalyst forming the iron catalyst filling layer 27 is formed at a side wall position corresponding to the iron catalyst filling layer 27 of the processing tank section 3.

An opening is formed at a position higher than the upper surface of the iron catalyst-filled layer 27 on the side wall of the treatment tank portion 3, and the processing is performed by connecting the opening to the opening formed on the upper side wall of the cleaning drainage tank portion 5. A communication portion 33 that connects the tank portion 3 and the cleaning drainage tank portion 5 is formed. The upper part of the iron catalyst packed layer 27 is a filtration member chamber 35. A disk-shaped filter member 37 having a diameter substantially the same as the inner diameter of the processing tank portion 3 is included in the filter member chamber 35. The filtering member 37 is made of, for example, a filter material such as expanded polystyrene having a specific gravity of 1 or less, and its effective pore size is set to, for example, about 1.2 mm in consideration of trapping of SS and pressure loss. The thickness of the filtering member 37 is smaller than the height of the opening of the communication portion 33.

The filter member chamber 35 has an upper limit position restricting plate 39 for the filter member 37, which is a perforated plate or a mesh screen installed in the treatment tank unit 3 at the height of the top of the communicating portion 33, and the iron catalyst packed layer 27. The upper and lower sides are defined by a lower limit position regulating plate 40 of the filtering member 37 including a perforated plate, a mesh screen, etc., which is installed above the upper surface of the. Therefore, the filtering member 37 can be moved up and down between the upper limit position regulation plate 39 and the lower limit position regulation plate 40 in the treatment tank unit 3 according to the position of the water surface in the treatment tank unit 3. The lower limit position regulating plate 40 of the filtering member 37 also plays a role of preventing mixing of the filtering member 37 and the iron catalyst when replenishing the iron catalyst.

Further, at the opening of the communicating portion 33, the filtering member 3
An outflow prevention plate 41 composed of a perforated plate or a mesh screen for preventing the outflow of the cleaning liquid 7 into the cleaning / drainage tank 5 is installed. Further, the lower edge 43 of the opening of the communication portion 33 is formed horizontally. Therefore, portions of the side wall of the processing tank portion 3 and the side wall of the cleaning / drainage tank portion 5 that form the lower edge 43 of the opening of the communication portion 33 become the overflow weir 44. The upper limit position regulating plate 39 and the outflow prevention plate 41 of the filtering member 37 are both formed by a perforated plate having a mesh size smaller than the effective hole diameter of the filtering member 37, a mesh screen, or the like.

An upper part of the upper limit position regulating plate 39 provided in the processing tank part 3 is an outlet chamber 45 for letting out the liquid to be processed from the processing tank part 3, and a lower side wall of the outlet chamber 45. That is, the upper limit position regulating plate 39 on the side wall of the processing tank section 3
An outflow pipe line 47 communicating with the outlet chamber 45 in order to let the water to be treated flow out from the outlet chamber 45 is connected to the upper vicinity portion. The outflow conduit 47 is provided with a treated water outlet valve 49 that controls the outflow of the treated water from the treatment tank section 3. A cleaning exhaust pipe line 51 for discharging cleaning air is provided on the upper surface of the cleaning drainage tank unit 5, and a cleaning drainage pipe line 53 for discharging cleaning water is provided on the lower surface of the cleaning drainage tank unit 5, respectively. It is connected. The cleaning exhaust pipe line 51 has a cleaning exhaust valve 55 for controlling the discharge of air from the treatment tank unit 3, and the cleaning drain pipe line 53 has a cleaning drain valve 57 for controlling the discharge of cleaning water from the treatment tank unit 3. Each is provided.

As shown in FIG. 2, the water treatment apparatus provided with the Fenton reaction tank 1 having the above-described structure has a treated water pipeline 5 as shown in FIG.
A chemical solution mixing tank 59 for injecting hydrogen peroxide into the water to be treated flowing through 8 and adjusting the pH of the water to be treated, and the water to be treated flowing from the chemical solution mixing tank 59 through the introduction pipe line 9. Fenton reaction tank 1 configured to perform oxidative decomposition by a Fenton reaction of a substance contained in, and an ultraviolet irradiation reaction tank 61 that irradiates ultraviolet rays to the water to be treated flowing from the Fenton reaction tank 1 through the outflow conduit 47, It is composed of a neutralization tank 63 for neutralizing the water to be treated flowing from the irradiation reaction tank 61 through the treated water pipe 62. To the chemical solution mixing tank 59, a hydrogen peroxide tank 67 is connected via a hydrogen peroxide supply pipeline 65, and a sulfuric acid tank 71 is further connected via a sulfuric acid supply pipeline 69. The hydrogen peroxide supply line 65 is provided with a hydrogen peroxide supply pump 73, and the sulfuric acid supply line 69 is provided with a sulfuric acid supply pump 74.

In the chemical liquid mixing tank 59, a mixer 75 for mixing the chemical liquid, that is, hydrogen peroxide or sulfuric acid with the water to be treated in the chemical liquid mixing tank 59, and the pH of the water to be treated in the chemical liquid mixing tank 59 are measured. A pH controller 77 for controlling the amount of sulfuric acid added to the water to be treated for adjusting the pH is provided. The inlet pipe 9 for guiding and inflowing the water to be treated in the chemical liquid mixing tank 59 into the Fenton reaction tank 1 is provided at a portion upstream from the water to be treated inlet valve 17 with respect to the flow of the water to be treated. A pump 79 for supplying treated water is provided. A blower 80 is connected upstream of the cleaning air blowing valve 23 in the cleaning air conduit 11 for supplying cleaning air to the Fenton reaction tank 1 with respect to the flow of air. The other end of the cleaning drainage pipe 53, which is connected to the cleaning drainage tank part 5 of the Fenton reaction tank 1 at one end, is connected to the cleaning drainage concentrating device.

The neutralization tank 63 is provided with a pH controller 82 for measuring the pH of the treated water 81 in the neutralization tank 63 and adjusting the pH. In addition, the neutralization tank 63
A discharge pipe 83 for discharging the treated water 81 whose pH has been adjusted is connected to the. At the bottom of the neutralization tank 63,
The other end of the cleaning water conduit 19 having one end connected to the introduction conduit 9 is connected to the cleaning water conduit 19, and the treated water 81 in the neutralization tank 63 is used as the cleaning water to transfer the solution to the Fenton reaction tank 1. A pump 85 for performing the operation is provided. Wash water line 19
Upstream of the pump 85 of the washing water,
A wash water supply valve 87 that controls the supply of wash water from the neutralization tank 63 is provided.

The operation of the Fenton reaction tank having such a structure and the features of the present invention will be described. In addition, in FIG. 1 and FIG. 3, the flow of the water to be treated and the washing water is a solid arrow,
The flow of cleaning air is indicated by the dashed arrow.

When purifying water to be treated, as shown in FIG.
As shown in FIG. 3, the treated water inlet valve 17 and the treated water outlet valve 4
9 is opened, and the wash water inlet valve 21, the wash water supply valve 87, the wash air blowing valve 23, the wash exhaust valve 55, and the wash drain valve 57 are closed. In this state, by driving the hydrogen peroxide supply pump 73 and the sulfuric acid supply pump 74, hydrogen peroxide is injected into the water to be treated 2 in the chemical solution mixing tank 59, and sulfuric acid is adjusted to a pH optimum for the Fenton reaction. Is adjusted by the addition of. Hydrogen peroxide is injected,
The water to be treated 2 whose pH has been adjusted flows from the chemical liquid mixing tank 59 to the Fenton reaction tank 1 by driving a pump 79 for feeding the water to be treated. As shown in FIG. 1, the water to be treated 2 flowing into the inlet chamber 7 of the Fenton reaction tank 1 uniformly flows upward in the iron catalyst packed bed 2 by the action of the plurality of strainers 31 fixed to the filter floor plate 29.

The water 2 to be treated flowing through the iron catalyst-packed layer 2 is a target substance such as dioxin, mainly due to the Fenton reaction on the surface of the iron catalyst filled in the iron catalyst-packed layer 2.
Oxidative decomposition of PCBs and biodegradable organic substances occurs.
Note that the Fenton reaction due to the dissolved iron also occurs on the surface of the floating SS. Subsequently, the water to be treated 2 enters the filtration member chamber 35, and SS and insoluble substances generated by the Fenton reaction in the water to be treated 2 are captured and filtered by the filtration member 37. At this time, the water level of the treated water 2 in the treated water tank unit 3 is
Since the outlet member 45 is located at a position higher than the top of the opening of the portion communicating with the outflow conduit 49, the filtering member 37 is in a position to hit the upper limit position regulating plate 39 by the buoyancy of the filtering member 37. Thus, the upper limit position regulating plate 39 prevents the filtering member 37 from being entrained in the filtered water.

As described above, the water to be treated from which the target substance is oxidatively decomposed by the Fenton reaction in the Fenton reaction tank 1 and the SS and the insoluble substances generated by the Fenton reaction are removed is subjected to an ultraviolet irradiation treatment as shown in FIG. Ultraviolet irradiation treatment is performed in the tank 61 to form treated water 81, which is neutralized in the neutralization tank 63 and then discharged.

By the way, when such a purification treatment of the water to be treated is carried out, the iron catalyst packed layer 27 and the filtering member 37 of the Fenton reaction tank 1 are clogged with SS and insoluble substances produced by the Fenton reaction. Therefore, the iron catalyst packed bed 27 and the filtering member 37 are set at predetermined intervals.
When the filtration resistance of No. 1 exceeds the specified value, the iron catalyst packed layer 27 and the filtration member 37 using both air and wash water are washed.
When performing cleaning, the treated water inlet valve 17 and the treated water outlet valve 49 are closed, and the treated water inlet valve 21 and the treated water supply valve 8
7, the cleaning exhaust valve 55, and the cleaning drain valve 57 are opened. At this time, the water level in the treatment tank unit 3 is as shown in FIG.
As shown in FIG. 3, the water drops to the position of the lower edge 43 of the opening formed in the communication portion 33 between the treated water tank portion 3 and the cleaning drainage tank portion 5.
As a result, the filtering member 37 moves below the position during the purification treatment of the water to be treated, and the upper surface of the filtering member 37 is located near the upper edge of the lower edge 43 of the opening formed in the communication portion 33. Becomes

In this state, the pump 85 for feeding the washing water is driven to feed the washing water, which is water containing no target substance, into the treatment tank section 3, and then the blower 81 is driven to drive the washing air. Open blow-in valve 23 and blower 81 to diffuser 1
When air is blown into the treatment tank portion 3 through the SS 3, the SS trapped in the iron catalyst packed layer 27 and the filtering member 37 are washed away by the bubble flow, and the treatment water tank portion 3 and the cleaning drainage tank portion 5 are separated from each other. It flows over the overflow weir 44 of the communication part 33 and is discharged from the cleaning drainage pipe 53 together with the cleaning water via the cleaning drainage tank part 5.
On the other hand, the air blown into the processing tank unit 3 is discharged from the cleaning exhaust pipe line 51 via the cleaning drainage tank unit 5. After that, the cleaning air blowing valve 23 is closed and only the cleaning water is flowed to clean the iron catalyst packed layer 27, the filtering member 37, the inner wall surface of the treated water tank portion 3 and the inner wall surface of the cleaning drainage tank portion 5. . When replenishing the iron catalyst, the drain valve 2
After opening 5 to discharge the water to be treated in the treatment tank portion 3, the iron catalyst is replenished from the iron catalyst replenishing port 32.

As described above, in the Fenton reaction tank 1 of this embodiment, the flow of the cleaning water accompanied by the bubbles flowing from the lower side of the iron catalyst packed layer 27, that is, the bubble flow, is performed at predetermined time intervals or the filtration of the iron catalyst packed layer. To remove the SS trapped in the iron catalyst-filled layer 27 and the insoluble substances generated by the Fenton reaction from the iron catalyst-filled layer 27 by washing the iron catalyst-filled layer 27 when the resistance becomes equal to or higher than a set value. You can Further, the wash water accompanied with SS or the like is discharged to the treatment tank portion 3 through the washing drainage tank portion 5 from the communication portion 33 located at a position lower than the communication position of the outflow passage 47 of the water to be treated. . Therefore, the place where SS or the like adheres to the secondary side inner wall surface of the Fenton reaction tank 1 is limited to the inner wall surface between the upper surface of the iron catalyst packed layer 27 and the communicating portion 33, and the outflow of the treated water The wash water does not flow in the flow path 47, and SS or the like does not adhere to the outflow flow path 47 of the water to be treated.

Therefore, since the places where SS and the like are attached are in a limited area of the secondary side inner wall surface of the Fenton reaction tank 1, the secondary side inner wall surface of the Fenton reaction tank 1 and the outflow passage 47 of the water to be treated are treated. After removing SS of the iron catalyst packed layer 27 and the like without removing waste water at the start of cleaning to remove adhered SS or purification of water to be treated, Fenton can be simply flushed. It is possible to remove SS and the like adhering to the inner wall surface of the secondary side of the reaction tank 1. Therefore, it is possible to reduce the inflow of SS into the ultraviolet irradiation treatment tank arranged in the subsequent stage of the Fenton reaction tank.

Further, since the filtering member 37 is provided between the upper surface of the iron catalyst packed layer 27 and the communicating position of the outflow passage 47 of the water to be treated, the iron catalyst packed layer 27 is treated when the water to be treated 2 is treated.
The SS or the like flowing out from the Fenton reaction tank 1 to the secondary side can be captured, and the SS or the like can be prevented from flowing out of the Fenton reaction tank 1 to a subsequent step. Therefore, the S to the ultraviolet irradiation treatment tank 61 arranged in the latter stage of the Fenton reaction tank 1
The inflow of S and the like can be further reduced. However, SS does not flow out from the iron catalyst packed layer 27 to the secondary side of the Fenton reaction tank 1 due to the relatively low concentration of SS contained in the water to be treated, or the amount of SS flowing out is treated in the ultraviolet irradiation treatment tank 61. If it does not affect the above, the filter member 37 may not be provided.

The filter member 37 is composed of the iron catalyst packed layer 27.
And the upper limit position regulating plate 39 provided near the lower part of the communication position of the outflow passage 47 can be moved up and down in accordance with the water level in the processing bath section 3. Therefore, when treating the water to be treated,
It is possible to prevent the SS from flowing into the outflow passage of the treated water by raising the filtering member 37 to the vicinity of the communication position of the outflow passage 47 of the treated water. In addition, at the time of cleaning, since the water level of the cleaning water is determined by the upper edge of the overflow weir 44, that is, the lower edge 43 of the opening of the communication portion 33, the upper surface of the filtering member 37 comes above the lower edge 43. Until the filtering member 37 is lowered. Therefore, the entire filtering member is washed with the bubble flow, and the S trapped by the filtering member is washed.
S can be removed.

By the way, a silica sand layer is used to remove SS,
In a Fenton reaction tank, etc. in which an iron catalyst packed layer is laminated on this silica sand layer and the water to be treated flows from above to below, when cleaning with a bubble flow, it goes upward from the bottom of the Fenton reaction tank. The bubbly flow causes the silica sand and the iron catalyst to mix, and the effective surface area of the iron catalyst is blocked by the silica sand.
However, in the Fenton reaction tank 1 of the present embodiment, since the vertically movable filter member 37 is used, the filter material and the iron catalyst do not mix, and the effective surface area of the iron catalyst does not decrease. The reaction efficiency of can be improved.

Furthermore, the Fenton reaction tank 1 of this embodiment
In the water treatment device equipped with
Since the water does not flow in, the efficiency of the ultraviolet irradiation treatment can be improved, and the water treatment efficiency of the water treatment device can be improved.

Further, the present invention is not limited to the configuration of the Fenton reaction tank and the water treatment device of the present embodiment, and various Fenton reaction tanks for performing the Fenton reaction by the iron catalyst and water treatment by the Fenton reaction and ultraviolet irradiation. It can be applied to various water treatment equipment.

[0037]

According to the present invention, it is possible to reduce the inflow of SS into the ultraviolet irradiation treatment tank disposed in the latter stage of the Fenton reaction tank.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of an embodiment of a Fenton reaction tank to which the present invention is applied and an operation of a state body performing water treatment.

FIG. 2 is a block diagram showing a schematic configuration of a water treatment device including a Fenton reaction tank to which the present invention is applied, and flows of water to be treated, washing water, and washing air.

FIG. 3 is a cross-sectional view showing a schematic configuration of an embodiment of a Fenton reaction tank to which the present invention is applied and an operation of a state body undergoing cleaning.

[Explanation of symbols]

1 Fenton reaction tank 3 processing tank 5 Cleaning drainage tank 9 introduction pipeline 27 Iron catalyst packed bed 33 Communication part 37 Filtration member 44 Overflow weir 47 Outflow pipeline

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenichiro Deguchi             5-2-1 Ginza, Chuo-ku, Tokyo Chiyoda             Within Kosho Co., Ltd. F-term (reference) 4D037 AA11 AB14 BA18 CA11                 4D050 AA12 AB45 BB09 BC06 BD02                       BD06 CA07                 4H006 AA05 AC13 AC26                 4H011 AA02 BA01 BB18 BC18 DA13                       DD01

Claims (5)

[Claims] 1. A discharge flow path for discharging the cleaning water and the cleaning air that have flowed in from below the iron catalyst-packed layer is connected to a position higher than the upper surface of the iron catalyst-packed layer filled with the iron catalyst.
A Fenton reaction tank for water treatment, wherein an outflow passage of the water to be treated that has flowed in from below the iron catalyst packed layer communicates with a position higher than the communicating portion of the discharge passage. 2. The Fenton reaction tank for water treatment according to claim 1, wherein a filter member is provided between the iron catalyst packed bed and the communicating portion of the outflow passage of the water to be treated. 3. The filter member is vertically movable between the iron catalyst packed bed and the communicating position of the outflow passage of the water to be treated, depending on the water level, and discharges the wash water and the wash air. The Fenton reaction tank for water treatment according to claim 2, wherein an overflow weir that determines the water level of the washing water at the time of washing is formed in the communication portion of the discharge flow path. 4. A cleaning air blowing means for blowing cleaning air is installed in an inlet chamber into which the water to be treated and the cleaning water flow, and the iron catalyst packed layer is provided on the inlet chamber. Is communicated with the inlet chamber via a plurality of strainers. The Fenton reaction tank for water treatment according to any one of claims 1 to 3, wherein. 5. A water treatment apparatus which allows water to be treated, into which hydrogen peroxide has been injected, to flow through a Fenton reaction tank equipped with an iron catalyst packed layer, and which irradiates the water to be treated flowing out of the Fenton reaction tank with ultraviolet rays. The water treatment apparatus, wherein the Fenton reaction tank is the Fenton reaction tank according to any one of claims 1 to 4.